혈흔형태분석을 이용한 빌라 살인사건 해결 사례

김기정,최준영,류경진,김상근,김영규,박정호,추창우,노주형,최용석,Kim, Gi-Jeong,Choi, Jun-Young,Ryu, Kyung-Jin,Kim, Sang-Geun,Kim, Young-Gyu,Park, Jeong-Ho,Chu, Chang-Woo,Rho, Ju-Hyung,Choi, Yong-Suk 대한수사과학회 2007 대한수사과학회지 Vol.2 No.1

한 방울의 피에서 유추한 현장재구성 사례

김기정,류경진,김상근,김영규,박정호,노주형,최용석,Kim, Gi-Jeong,Ryu, Kyung-Jin,Kim, Sang-Geun,Kim, Young-Gyu,Park, Jeong-Ho,Rho, Ju-Hyung,Choi, Yong-Suk 대한수사과학회 2006 대한수사과학회지 Vol.1 No.1

Turvey 행동증거분석과 살인사건 현장분석 사례

김기정,김상근,김영규,박정호,노주형,류경진,추창우,임채원,최용석,Kim, Gi-Jeong,Kim, Sang-Geun,Kim, Young-Gyu,Park, Jeong-Ho,Rho, Ju-Hyung,Ryu, Kyung-Jin,Chu, Chang-Woo,Im, Chae-Won,Choi, Yong-Suk 대한수사과학회 2006 대한수사과학회지 Vol.1 No.2

단결정 그라핀 위에서의 퓨란의 고리모양 형성

김기정,양세나,박영찬,이한구,김봉수,이한길,Kim, Ki-Jeong,Yang, Se-Na,Park, Young-Chan,Lee, Han-Koo,Kim, Bong-Soo,Lee, Han-Gil 한국진공학회 2011 Applied Science and Convergence Technology Vol.20 No.4

본 연구 그룹은 6H-SiC (0001)에서 성장시킨 그라핀 층에 흡착된 퓨란(furan)의 고리 형성과 전자적 성질을 원자 힘 현미경(Atomic Force Microscope : AFM), C K-edge에 대한 Near Edge X-ray Absorption Fine Structure (NEXAFS) 스펙트럼, 핵심부 준위 광전자 분광스펙트럼(Core-level Photoemission Spectroscopy : CLPES)을 이용하여 연구했다. 우리는 그라핀위에 흡착된 퓨란 분자들이 화학적 도핑이 가능한 산소기의 홀 전자쌍을 통하여 그라핀의 특성을 조절할 수 있는 화학적 기능화에 이용될 수 있다는 것을 알아냈다. 또한, 퓨란이 자발적으로 세 가지의 다른 결합 구조들 중 하나로 고리를 형성한다는 것과 그라핀 위에 퓨란에 의해 형성된 고리의 전자적 성질들이 AFM, NEXAFS, CLPES를 이용하여 각각 설명될 수 있다는 것을 보여주었다. The ring formation and electronic properties of furan adsorbed on graphene layers grown on 6H-SiC (0001) has been investigated using atomic force microscopy (AFM), near edge X-ray absorption fine structure (NEXAFS) spectra for the C K-edge, and core level photoemission spectroscopy (CLPES). Moreover, we observed that furan molecules adsorbed on graphene could be used for chemical functionalization via the lone pair electrons of the oxygen group, allowing chemical doping. We also found that furan spontaneously form rings with one of three different bonding configurations and the electronic properties of the ring formed by furan on graphene can be described using by AFM, NEXAFS and CLPES, respectively.

낙차공이 있는 복단면 수로에서 사주거동의 수치분석

김기정,장창래,Kim, Gi-Jung,Jang, Chang-Lae 응용생태공학회 2016 Ecology and resilient infrastructure Vol.3 No.1

본 연구에서는 2차원 수치모형을 이용하여 복단면 하도에서 낙차공을 고려하여 하도 변화와 사주의 거동 특성을 분석하였다. 교호사주에 의하여 흐름이 분리되며, 사주의 선단부에서 흐름이 집중되고 수충부가 형성되었다. 낙차공에 의하여 흐름은 하도 전체에 균등하게 분산되었으며, 낙차공 하류에서는 흐름이 집중되고 하상고가 낮아졌다. 그러나 사주의 형상은 낙차공 상류의 영향을 받아 교호사주의 형상을 유지되었다. 하폭 대 수심이 증가하면서 교호사주, 중앙사주, 복렬사주가 형성되었으며, 사주의 수가 증가하였다. 낙차공에 의하여 흐름이 집중되어 낙차공 상류에서 사주길이보다 낙차공 하류에서 사주길이가 더 짧게 나타났다. This study investigated the behavior of sediment bars in a compound channel with a drop structure. Flow was separated into side banks by alternate bars, and flow was concentrated into the downstream of bar fronts. The bed downstream of a drop structure degradated due to the concentrated flow from it. Bar shapes were kept by the influence of their shapes upstream. Alternate bars, central bars, and multiple bars were developed as the width to depth ratio increased, and the number of bars increased. The bar in the downstream of a drop structure decreased in length due to the concentration of flow and its disturbance.

저상굴절버스의 전 차륜 조향 시스템 ECU 개발에 대한 연구

김기정,이수호,정기현,최경희,박태원,문경호,Kim, Ki-Jeong,Lee, Soo-Ho,Chung, Ki-Hyun,Choi, Kyung-Hee,Park, Tae-Won,Moon, Kyeong-Ho 한국정보처리학회 2010 정보처리학회논문지 A Vol.17 No.1

삶의 질이 높아지고 고령화 사회가 시작되면서, 사회적 약자들이 사용하기 쉬운 교통수단의 개발의 필요성이 증대되고 있다. 이러한 요구에 부응하기 위해, 한국철도기술연구원에서 주관하여 저상굴절버스(Bi-modal Tram)의 개발을 시작하게 되었다. 이 저상굴절버스는 버스와 같은 높은 접근성의 특징을 가져야 할 뿐만 아니라, 지하철과 같이 차체가 낮아야 하며, 휠체어나 승객의 발이 승강장과 차량 사이 틈에 끼지 않도록 정확한 주차가 이루어져야 한다. 하지만 저상굴절차량의 길이가 길어, 이러한 요건을 맞추기 위해서는 전 차륜 조향 시스템이 개발-장착되어야 한다. 전 차륜 조향 시스템이 장착된 저상굴절차량은 1축 차륜이 조향될 뿐 아니라, 1축 조향각 또는 굴절각과 속도 등의 상태에 따라 2축과 3축 차륜이 조향되는 특징을 가지고 있다. 본 연구에서는 전 차륜 조향장치의 개발 과정을 다룬다. As standard of living is higher and aging society is coming, it is needed to develop transportation that is easy to use for weak person. To comply with the demands, it is started to make Bi-modal Tram that is on KRRI(Korea Railroad Research Institute)'s hands. This tram has to have good accessibility like bus, be low level from ground like subway, and park accurately so wheel chair's or passenger's foot can't fall into the gap. But Bi-modal Tram have long length, so it need development of All Wheel Steering System. The Bi-modal Tram that have all wheel steering system steer not only the first axle but also the second and third axle from the first axle or articulation angle, and velocity, and so on. At this study, we discuss AWS ECU's development process.

테레프탈레이트계 폴리에스터의 열분해 거동에 관한 연구

김기정,여정섭,윤지영,김준호,Kim Ki Jeong,Yeo Jeong Sup,Yoon Ji Young,Kim Joon Ho 한국섬유공학회 2005 한국섬유공학회지 Vol.42 No.4

Thermal degradation behavior of the three homologous polyesters, poly(ethylene terephthalate)(PET), poly(trimethylene terephthalate)(PTT) and poly(butylene terephthalate)(PBT) were investigated by using thermogravimetric analysis(TGA) and pyrolysis-gas chromatography-mass spectrometry(PGC-MS). From the results of isothermal thermogravimetry, it was revealed that PTT has higher activation energy of thermal degradation than the other two polyesters. In PGC-MS analysis, the highly volatile products of the polyesters such as acetaldehyde and acetic acid evolved in the early stage of pyrolysis as common degradation products. Benzoic acid, methyl ester of benzoic acid, terephthalic acid and higher oligomers were produced as the main degradation products of poly(alkylene terephthalate)s at longer pyrolysis times. In isothermal pyrolysis, PTT showed the fastest thermal degradation rate among the three polyesters.

대학생 집단의 학습기술·학습동기·학업적응도와 학업성취와의 관계

김기정 서원대학교 2004 敎育發展 Vol.23 No.1

The study skills, learning motivation. academic adjustments are the significant factors that positively influence the learning process of school learners. In this study, the study skills were measured by 7sub-skills of self-managements, listening and participating in class, task-solving, effectively reading, report writing, information processing, and test-taking Learning motivation were composed of academic self-efficacy and academic failure tolerance And academic adjustments were composed of single scale with 20 items. The purpose of this study were to examine relationships between these process variables and learning outcomes, to explore the relative importance and combined effects of these process variables(10 factors) to academic achievements, and to find the differences in the process variables by sex and academic achievements levels. For this study, 100 male students and 229 female students were purposively sampled in S University. Their GPA were also obtained from their instructors. The major findings in this study were as followings. First, the study skills, learning motivation, and academic adjustments were closely interrelated with the correlation of .53 - .72. The combined effects of study skills and learning motivation to academic-adjustments were 61 percent. Among the variance, the test-taking skill had 57 percent, and self-efficacy skill, task-solving skill, and effectively reading skill had 11 percent, 2 percent, and 1 percent respectively. Second, lower achiever showed more negative behavior and attitudes than normal and higher achiever in 9 factors of the learning process variables. Among these factors. task-solving skill were found to be most important factor through regression analysis. This factor explained 15 percent of variance of academic achievements. Third, the level that college students have utilized study skills in their school learning were 2.8 and the level of learning motivation were 2.5 on 4-point scale. The skill that the students used most frequently were task-solving(3.1 point). Female students showed more positive behavior than male students in the use of study skills. In learning motivation, male showed more positive attitudes. But there were no significant differences by sex in academic adjustment.

표면치밀화 기술에 의해 제조된 소결 기어의 기계적 특성

김기정,김기범,이두환,박종관,정동국,Kim, Ki-Jung,Kim, Ki-Bum,Lee, Doo-Hwan,Park, Jong-Kwan,Jeong, Dong-Guk 한국분말야금학회 2012 한국분말재료학회지 (KPMI) Vol.19 No.3

A novel PM (powder metallurgy) steel for automotive power-train gear components was developed to reduce manufacturing cost, while meeting application requirements. The high-density PM steel was manufactured by mixing using special Cr-Mo atomized iron powders, high-pressure compaction, and sintering. Tensile strength, charpy impact, bending fatigue, and contact fatigue tests for the PM steel were carried out and compared to conventional forged steel. Pinion gears for auto-transmission were also manufactured by helical pressing, sintering, and surface densification process. In order to evaluate the durability of the PM parts, auto-transmission durability tests were performed using dynamometer tests. Results showed that the PM steel fulfilled the requirements for pinion gears indicating suitable tensile, bending fatigue, contact fatigue strengths and improved gear tooth profile. The PM gears also showed good performance during the transmission durability tests. As a result, the PM gears showed significant potential to replace the conventional forged steel gears manufactured by tooth machining (hobbing, shaving, and grinding) processes.

한국인 악안면 기형환자의 하악골 상행지에 관한 해부학적 연구

김기정,이의웅,Kim, Gi-Jung,Lee, Eui-Wung 대한구강악안면외과학회 2001 대한구강악안면외과학회지 Vol.27 No.3

Orthognathic surgery of the mandibular prognathism and the retrognathism is tend to be performed on the mandibular ramus to prevent inferor alveolar nerve injuries. The purpose of this study is to find a safe and accurate reference point on mandibular ramus for orthognathic surgery by comparative anatomical study of dentofacial deformity patients. We use 38 Korean Cadavers with normal occlusion(Group 1), 3-dimensional simulation of computerized tomogram of 23 patients with retrognathism (Group 2), 27 patients with mandibular prognathism (Group 3). Following results are obtained : 1. The maximum thickness of the mandibular ramus is $8.78{\pm}1.15mm$ for Group 2, $7.61{\pm}1.26mm$ for Group 1, $6.95{\pm}0.82mm$ for Group3 respectively (P=0001). The minimum thickness is $5.51{\pm}1.08mm$ for Group 1, $5.06{\pm}0.40mm$ for Group 2, $4.56{\pm}0.78mm$ for Group3, respectively (p=0.0001). But, the thickness at the level of 5mm above the lingular is $0.78{\pm}0.65mm$ for Group 2, $5.63{\pm}1.28mm$ for Group 1, $5.32{\pm}0.91mm$ for Group 3, respectively. There is no significant difference between these groups(P=0.0510). 2. The horizontal location from the midwaist point to lingular is $0.18{\pm}1.57mm$ for Group 1, $0.69{\pm}1.33mm$ for Group 2, $0.66{\pm}1.66mm$ for Group 3, and there is no significant difference between these groups(p=0.0835). But the vertical location from the midwaist point to lingular is $1.45{\pm}2.64mm$ for Group 1, $0.63{\pm}1.44mm$ for Group 2, $0.34{\pm}1.81mm$ for Group 3, and there is significant difference between these groups(p=0.0030). 3. The horizontal location from the midwaist point to mandibular foramen is $0.29{\pm}1.75mm$ for Group 1, $0.63{\pm}1.44mm$ for Group 2, $0.34{\pm}1.81mm$ for Group 3, and there is no significant difference between these groups(p=0.5403). But the vertical location from the midwaist point to mandibular foramen is $-3.33{\pm}4.43mm$ for Group1, $-4.79{\pm}2.26mm$ for Group 2, $-6.06{\pm}2.99mm$ for Group 3, and there is significant difference between these groups(P=0.0001). 4. The horizontal length from the disto-buccal cusp tip of mandibular second molar to lingula is $30.97{\pm}4.17mm$ for Group 3, $28.29{\pm}2.65mm$ for Group 1, $25.48{\pm}0.77mm$ for Group 2 (p=0.0000), and also vertical length is $7.72{\pm}3.22mm$ for Group 3, $6.38{\pm}1.83mm$ for Group 1, $5.89{\pm}2.30mm$ for Group 2 (P=0.0014). 5. The location of lingular is 0.50 from anterior border of mandibular ramus in all groups, if it assumed the length from anterior border to posterior border is 1. And it is almost 0.33 from the sigmoid notch, if it assumed the length from sigmoid notch to antegonial notch is 1. 6. In Group 1, Antilingular prominence is located on ($1.12{\pm}1.43mm,\;4.01{\pm}2.36mm$) from the midwaist point, and there is no correlation between antilingular prominence and lingular, mandibular foramen.